![]() PS: Unfortunately, there may be many thing that seem to fail on a perfectly working Windows system, so you'll have to study all errors carefully. Then you should look for queries on HKEY_CLASSES_ROOT\ that fail (with the NAME_NOT_FOUND error for example), or queries on HKEY_CLASSES_ROOT\CLSID\ that fail. You should put a filter on the working process (here: Regsvr32.exe) to only capture what's interesting. If you don't have access to the original DLL source, I would suggest to use SysInternal's Process Monitor tool to track COM registry lookups (there use to be a more simple RegMon tool but it may not work any more). If you get this error when trying to register a DLL, it may be possible that the registration code for this DLL is trying to instantiate another COM server (DLL or EXE) which is missing or not registered on this installation. Basically, a COM class is not declared in the installation registry. ![]() Error 0x80040154 is COM's REGDB_E_CLASSNOTREG, which means "Class not registered".
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